After his team lost the championship, he cried his eyes out in disappointment.

cried 是动词 cry 的过去式，意思是"哭泣"。 his 是形容词性物主代词，表示"他的"。 eyes 是 eye 的复数形式，意思是"眼睛"。 out 在这里表示"完全地、彻底地"。 cried his eyes out 是一个固定短语，字面意思是"把眼睛都哭出来了"，用来形容极度悲伤、痛哭流涕的状态。